I have a 20v jtdm 200hp from 2006 and it has an alloy intake with swirls. I will shortly be having the manifold out while the cambelt is off and I want to do everything in there that I need while it's 'dead'. Rather than taking out, cleaning and plugging the swirl flap shaft holes to de-swirl the manifold, is there a decent flowing non-swirl manifold for the 20v that I can buy and just replace this one with and it will all bolt in to the throttle body etc and be as good otherwise?

Searched it up and only found mention of an early non-swirl 16v manifold so wondered if the same thing existed for the 5 cylinder and if there was any reason to/not to do this rather than removing my swirl flaps. They are disabled open and it runs a lot better but I want them gone and the thing cleaned up (EGR is also being mapped out when hot, DPF is already gone and mapped out, so far I'm 10mpg up and smoother from low rpm).

Thanks for the posts guys, Autolusso above send me one for £90 I think it was, delivered and it was the later style flap one as we discovered the early on will NOT swap over, the head looks different and all the EGR/throttle body etc is a lot different. So I went for another one the same as mine with the swirl flaps which are easily removed, the shft holes plugged, clean it all up and will swap it for the other one while the cambelt is being done (easy time to take the common rail pump off, needed to access the manifold).

Thanks for the posts guys, Autolusso above send me one for £90 I think it was, delivered and it was the later style flap one as we discovered the early on will NOT swap over, the head looks different and all the EGR/throttle body etc is a lot different. So I went for another one the same as mine with the swirl flaps which are easily removed, the shft holes plugged, clean it all up and will swap it for the other one while the cambelt is being done (easy time to take the common rail pump off, needed to access the manifold).

probably a 10v inlet then ,
I use the backplate of a 159 manifold on my 156 , no problem! egr and trottle body mountings are the same.

Mounting one shouldn't be a problem , the actuator fits right back to the manifold , just leave the leverarm of.